Automatic stop foe



0. 0. STORLE.

AUTOMATIC $10? FOR GRAMOPHONES.

APPLICATION FILED MAR. 21, I919.

Patented Sept. 30, 1919.

B W,%Mw4% OLE 0. STORLE, OF TACOMA, WASHINGTON.

AUTOMATIC STOP FOR GRAMOPHONES.

Specification of Letters Patent.

Patented Sept. 34), 19.19.

Application filed March 21, 1919. Serial No. 284,172.

To all whom it may concern:

Be it known that I, OLE O. STORLE, a citizen of the United States, residing at Tacoma, in the county of Pierce and State of lVashington, have invented certain new and useful Improvements in Automatic Stops for Gramophones, of which the following is a specification, reference being had to the accompanying drawing, forming a part thereof.

This invention relates to sound producing machines in which record disks are used having spiral grooves, and a tone arm carrying the stylus which traverses the record grooves, swings over a record supporting table transversely to the record grooves.

The main objects of the invention are to automatically stop machines of this type at the ends of record grooves of different lengths which terminate at different distances from the center of the record disks; to avoid the care and trouble involved in ad justing the stop mechanism for records of different lengths; and generally to improve the construction and operation and increase the utility and convenience of devices of this class.

It consists in the construction and organization of elements as hereinafter particularly described and pointed out in the claims, for the purposes set forth.

In the accompanying drawing like characters designate the same parts in the several figures.

Figure 1 is a plan view of stop mechanism embodying the invention as applied to a gramophone, parts of which are shown; Fig. 2 is a side elevation of the stop mechanism, the turn table of the gramophone being shown in central vertical section; Fig. 3 is a plan view of a part of the stop mech anism, showing parts thereof in the positions they occupy just before the brake is released and applied; and Fig. 4 is a plan view of the mechanism showing the latch disengaged and the brake set or applied.

Referring to Figs. 1 and2, 1 designates a part of the tone arm, 2 the turn table or rotary record support of a gramophone or typical sound reproducing machine, and 3 the turn table spindle.

The stop mechanism is shown as mounted on a metallic base plate 4, which is fastened to the top board or plate or other part of the gramophone in any suitable manner.

Fen angular brake lever 6, pivotelly mounted at its elbow on the plate 4, adjacent one end thereof, is provided at one end with a shoe or pad 7, of rubber or other suitable elastic material, in position to cooperate with the depending flange or rim of the turn table 2, to stop the machine. A latch or detent 9, pivoted to the other end of the brake lever 6, is adapted by engagement with a pin or stud l0, fastened in the plate 4, to hold the brake in release Or oil position, with the shoe or pad 7 out of engagement with the rim of the turn table, as shown in Fig. 1. Aspring 12, connected with the latch 9 and plate 4, tends to holdthe latch in engagementwith the stud 10, and when it isdisengaged there from, to carry the shoe or pad 7 into engagement with the rim of the turn table, thereby setting or applying the brake- An angular lever 14, mounted at its elbow on the same pivot pin or stud with the brake lever 6, and having an arm provided with upwardly projecting lugs 15 on opposite sides of the short arm of the brake lever, affords means for manually releasing and applying the brake.

By turning the longer arm of the lever 14, which projects outwardly beyond the rim of the turn table, to the right, as shown in Fig. 1, the latch 9 is disengaged from the stud 10 by the engagement of the shorter arm of said lever with a lug 16 on the latch, thereby releasing the brake lever and permitting the application of the brake to the turn table by the spring 12. Turning the longer arm of the lever 14 to the left, withdraws the shoe or pad 7 from the rim of the turn table, thereby releasing the brake and carrying the latch 9 into position to be engaged by the spring 12 with the stud 10.

The lugs 15 are spaced to permit a limited movement of the lever 14 relative to the brake lever 6, sufficient to disengage the latch 9 from the stud 10 for unlocking and permitting the application of the brake.

A short horizontal shaft havinga bearing on the under side of the plate 4, is provided at one end with a worm wheel 18, which meshes with a worm 19 on the spindle 3 of the turn table. At the opposite end this shaft is provided with a crank 21 and a cam 22. A longitudinally reciprocating.

and laterally shiftable or movable'brake releasing arm or member 24, has a jointed connection at one end with the crank21, and is loosely confined adj :ent to its opposite anti. by a keeper or guide 525, attachee to the V if 65 it engages with the under side'of the drag under side of the plate 4. The arm or-member 24 is provided on one side with a hook or lug 26, which is adapted to engage with a lug 27 extending downwardly from the latch 9 through an opening in the plate 4, and to disengage the latch from the stud 10 and thereby release and permit the ap plication'of the brake when the arm or memwith a lock nut 37 for holding it in adjusted position. 7 r

A friction drag arm 40, loosely pivoted at i one end on the upper end of the spindle 31 and normally resting on the rim of the friction segment ;or' member 30, extends over the cam 22, and is provided with a downwardly projecting pin or stud 41, loosely engaging a longitudinal slot in the brake releasing arm or member 24. The arm 40 is also provided with a downwardly projecting pin or lug 42, arranged to be engaged by the cam 22 for periodically shifting said arm backward in a direction reverse to its movement by the friction segment or member 30.

In the operationof the stop mechanism, the stylus or'tracing point being entered in the record groove of a disk placed on the table 2, and the brake being released or retracted and locked in its off position, as

shown in Fig. 1, with. the rotation of the turn table and record disk, the crank 21 and cam 22 are rotated by the worm gear 18 and worm 19, and the friction segment or member 30 is turned clockwise by its connection with the arm 34 as the stylus traverses the record groove and the tone arm 1 is swung slowly toward the center of the turn table. The segment or member 30 tends by frictional engagement to carry the-drag arm 40 resting thereon, with it, and to shift and hold the brake releasing arm 24 out ofoperative position, as shown in Fig. 1, to engage with the lug 27 on the latch or detent 9.

With each revolution of the crank 21, the

- arm 24 is reciprocated and the hook or lug 26 thereon is movedback and forth past the latch lug 27 without effect thereon, until the stylus reaches the end of the record groove and the movement of the tone arm 1 toward the center of the record disk is arrested. Wlth each revolution of the cam 22 and reciprocation of'the arm 24 as said cam passes through the upper part of its circuit,

arm 40, lifting it out of contact with the friction segment 30 and simultaneously by engagement with the pin or lug 42, shifts said arm backward toward the spindle 3 in a direction reverse to its movement by the friction segment, thereby swinging the arm 24 toward the lug 27, but the crank 21 and of the hook 26, that said hook in itsreturn movement toward the crank shaft, passes the lug 27 before the arm 24 is swung by the cam 22 and arm 40 far enough backward to engage with said lug, while the the cam 22 are so set relative to the location stylus is traversing a record groove and the tone arm is moving toward the center'of the turn table. 1

When however, thestylus reaches the end of the record groove and the consequent movement of the tone arm toward the center of the turn table is arrested, thereby arresting the movement of the friction seg ment 30, the next backward movement of the drag arm 40' toward the spindle 3 by the cam 22, will swing the arm 24 into and leave it in position, as shown in Fig. 3, for engagement of the hook-26 with the lug 27, so that on the next return movement of the hook by the crank 21 toward the crank shaft, the hook engaging with the lug, will disengage the latch 9 from the stud 10 and permit'the spring 12 to carry the-shoe or required to overcome the resistance to the advance of the tone arm by the fl'lctlOlla-l' engagement of the drag arm in 1tsback-- Ward movement with the advancing segment 30, and avoids all interference with the operation of the stylus in-the reproduction of the record.

Various changes in the details of construetion and arrangement of parts may be made without departure from the principle and scope of the invention as defined in the following claims. V

I claim: -1. In automatic. stop for gramophones, the combination of a brake, a spring tending to'set the brake, a detent for holding the brake in off position, a reciprocatory brake releasing member movable laterally.

into and out of position to engage and trip the detent, means actuated by the tone arm and tending when the stylus is traversinga record to shift the brake'releasing member out of operative position, and means connected with the turn tablespindle and adapted to reciprocate the brake releasing member longitudinally and to periodically shift said member laterally into operative position.

2. In an automatic sto for gramophones, the combination of a bra *e, a sprin tending to set the brake, a detent for ho ding the brake in off position, a reciprocatory brake releasing member movable laterally into and out of position to engage the detent, a frictional actuating connection with the tone arm tending to shift the brake releasing member laterally out of operative position while the stylus is traversing a record groove, and an actuating connection with the turn table spindle adapted to reciprocate the brake releasing member longitudinally and-to periodically shift said member laterally into operative position for engagement with the detent while said spindle rotates.

3. In an automatic stop for gramophones, the combination of a brake lever, a detent for holding the brake released, a spring tending to set the brake, a longitudinally and reciprocating brake releasing member shiftable laterally into and out of position for engagement with the detent, an oscillatory friction member actuated by the tone arm, a drag arm connected with the brake releasing member and tending to shift it away from operative position, a crank connected with the brake releasing member, a cam connected and rotatable with the crank for periodically shifting the brake releasing member into operatlve position, and a worm and worm wheel operatively connecting the crank and cam with the turn table spindle.

4c. In an automatic stop for gramophones, the combination of a brake, a spring tending to set the brake, a detent for holding the brake in mi position, a reciprocatory and oscillatory brake releasing member movable laterally into and out of position to engage and trip the detent, an oscillatory friction member, a pivoted drag arm normally on gaging the friction member and tending to shift the brake reelasing member laterally out of operative position, means actuated by the turn table spindle and adapted to reciprocate the brake releasing member longitudinally and to periodically disengage the drag arm from the friction member and shift the brake releasing member laterally back into operative position to engage the detent and to trip the detent and release the brake when the stylus reaches the end of a record and the movement of the tone arm toward the center of the turn table is arrested.

5. In an automatic stop for gramophones, the combination of a brake lever, a detent pivoted to the brake lever and adapted to hold the brake in off position, a spring connected with the detent and tending to apply the brake and to hold the detent in looking position and the brake in oif position, a controlling lever capable of limited movement independently of the brake lever and adapted by its movement in one direction to dis engage the detent and permit application of the brake and by its movement in the opposite direction to shift the brake into off position, a reciprocatory and oscillatory brake releasing member, means actuated by the tone arm and tending to shift said member into inoperative position, and means actuated by the turn table spindle and adapted to reciprocate said member and to shift it in the opposite direction into position to trip the detent when the stylus reaches the end of a record and the movement of the tone arm toward the center of the turn table is arrested.

6. In an automatic stop for gramophones, the combination of a brake lever, a spring tending to apply the brake, a detent for holding the brake lever in off position, a longitudinally slotted reciprocatory and oscillatory brake releasing arm, a pivoted drag arm provided with a pin engaging the slot in the brake releasing arm, an oscillatory friction member connected with the tone arm and tending to shift the drag arm which rests thereon and the brake releasing arm out of position for tripping the detent, a crank connected with and adapted to reaprocate the brake releasing arm, a cam adapted to periodically lift the drag arm out of engagement with the friction member and to shift the brake releasing member back into operative position for tripping the detent when the end of a record is reached by the stylus and the movement of the tone arm toward the center of the turn table is arrested, and a worm and worm gear connecting the crank and cam with the turn table spindle.

In witness whereof I hereto aflix my signature.

OLE O. STORLE.

copies of this patent may be obtained for five cents each, by addressing the Commissioner or Patents,

Washington, I). 0. v 

